从Angular 5升级到6之后:错误:未捕获(承诺中):TypeError:undefined不是函数

Question

在https://update.angular.io/为了将我的Angular 5 SPA升级到Angular 6，我在导航到应用程序后出现了这个错误：

ERROR Error: Uncaught (in promise): TypeError: undefined is not a function
TypeError: undefined is not a function
at Array.map (<anonymous>)
at webpackAsyncContext ($_lazy_route_resource lazy namespace object:21)
at SystemJsNgModuleLoader.push../node_modules/@angular/core/fesm5/core.js.SystemJsNgModuleLoader.loadAndCompile (core.js:4997)
at SystemJsNgModuleLoader.push../node_modules/@angular/core/fesm5/core.js.SystemJsNgModuleLoader.load (core.js:4989)
at RouterConfigLoader.push../node_modules/@angular/router/fesm5/router.js.RouterConfigLoader.loadModuleFactory (router.js:3257)
at RouterConfigLoader.push../node_modules/@angular/router/fesm5/router.js.RouterConfigLoader.load (router.js:3245)
at MergeMapSubscriber.project (router.js:1517)
at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._tryNext (mergeMap.js:60)
at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._next (mergeMap.js:50)
at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next (Subscriber.js:54)
at Array.map (<anonymous>)
at webpackAsyncContext ($_lazy_route_resource lazy namespace object:21)
at SystemJsNgModuleLoader.push../node_modules/@angular/core/fesm5/core.js.SystemJsNgModuleLoader.loadAndCompile (core.js:4997)
at SystemJsNgModuleLoader.push../node_modules/@angular/core/fesm5/core.js.SystemJsNgModuleLoader.load (core.js:4989)
at RouterConfigLoader.push../node_modules/@angular/router/fesm5/router.js.RouterConfigLoader.loadModuleFactory (router.js:3257)
at RouterConfigLoader.push../node_modules/@angular/router/fesm5/router.js.RouterConfigLoader.load (router.js:3245)
at MergeMapSubscriber.project (router.js:1517)
at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._tryNext (mergeMap.js:60)
at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._next (mergeMap.js:50)
at MergeMapSubscriber.push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next (Subscriber.js:54)
at resolvePromise (zone.js:814)
at resolvePromise (zone.js:771)
at zone.js:873
at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:421)
at Object.onInvokeTask (core.js:3816)
at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:420)
at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (zone.js:188)
at drainMicroTaskQueue (zone.js:595)
at ZoneTask.push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (zone.js:500)
at invokeTask (zone.js:1540)

我想这与我的懒惰加载功能模块路由有关，该路由由AuthGuard使用角度路由器的canActivate Feature进行保护，但由于这发生在我的应用程序代码之外，我有点不知所措。

我还尝试使用Angular CLI 6.1.2从头开始创建一个新的Angular 6应用程序，然后转移到我的应用程序上，但这导致了完全相同的错误。

这是我的包.json

{
"name": "client-app",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build --prod",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "^6.1.0",
"@angular/cdk": "^6.2.0",
"@angular/common": "^6.1.0",
"@angular/compiler": "^6.1.0",
"@angular/core": "^6.1.0",
"@angular/flex-layout": "^6.0.0-beta.17",
"@angular/forms": "^6.1.0",
"@angular/http": "^6.1.0",
"@angular/material": "^6.4.2",
"@angular/material-moment-adapter": "^6.4.2",
"@angular/platform-browser": "^6.1.0",
"@angular/platform-browser-dynamic": "^6.1.0",
"@angular/router": "^6.1.0",
"@aspnet/signalr": "^1.0.2",
"@ngx-translate/core": "^10.0.2",
"@ngx-translate/http-loader": "^3.0.1",
"@types/file-saver": "^1.3.0",
"@types/hellojs": "^1.16.1",
"chart.js": "^2.7.2",
"chartjs-plugin-annotation": "^0.5.7",
"chartjs-plugin-datalabels": "^0.3.0",
"chartjs-plugin-zoom": "^0.6.3",
"core-js": "^2.5.4",
"file-saver": "^1.3.8",
"hammerjs": "^2.0.8",
"hellojs": "^1.17.1",
"moment": "^2.22.2",
"ng2-charts": "^1.6.0",
"rxjs": "^6.0.0",
"saturn-datepicker": "^6.0.3",
"zone.js": "~0.8.26"
},
"devDependencies": {
"@angular-devkit/build-angular": "~0.7.0",
"@angular/cli": "~6.1.2",
"@angular/compiler-cli": "^6.1.0",
"@angular/language-service": "^6.1.0",
"@types/jasmine": "~2.8.6",
"@types/jasminewd2": "~2.0.3",
"@types/node": "~8.9.4",
"codelyzer": "~4.2.1",
"jasmine-core": "~2.99.1",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~1.7.1",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~2.0.0",
"karma-jasmine": "~1.1.1",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.3.0",
"ts-node": "~5.0.1",
"tslint": "~5.9.1",
"typescript": "~2.7.2"
}
}

我的模块级路由配置如下：

const routes: Routes = [
{
path: 'login-redirect',
component: LoginRedirectComponent
},
{
path: 'settings',
canActivate: [AuthGuard],
component: SettingsComponent
},
{
path: 'showcase',
canActivate: [AuthGuard],
loadChildren: '../showcase/showcase.module#ShowcaseModule'
},
{
path: 'feature1',
canActivate: [AuthGuard],
loadChildren: '../feature1/feature1.module#Feature1Module'
},
{
path: 'feature2',
canActivate: [AuthGuard],
loadChildren: '../feature2/feature2.module#Feature2Module'
},
{
path: '**', redirectTo: '/feature2'
}
];

Answer 1

经过长时间的谷歌搜索，这个链接为我指明了正确的方向：angular6功能模块延迟加载抛出错误类型错误：未定义不是功能

我在app.module中导入延迟加载的功能模块，这导致了问题。这在Angular 5中显然不是问题。

因此，删除我懒惰加载的功能模块的导入就解决了这个问题。

Answer 2

对于将来发现这一点的其他人。我也遇到了同样的问题，但没有在我的app.module.ts中导入懒惰模块，其他建议的解决方案也没有帮助。

我很懒地加载了一个使用自定义角度组件库的模块。这个库在ng5中运行良好，但当我们升级到ng6时，这个错误就开始发生了。

这个修复与错误完全无关，事实上，这个错误是非常误导和无用的！事实证明，在我们的自定义库中，我们从索引文件中导入了一些模块，无论出于何种原因，Angular编译器仍然无法理解。

// This is BAD!
import { MyModule } from '../my-modules/index';
// This is GOOD?
import { MyModule } from '../my-modules/my.module';

希望这能帮助到别人！